I’m at that stage with The Brothers Karamazov right now. I have no idea what people see in it. Book 1 chapter 5.
It wasn't really fun to read. But like all russian novels, it's very long, devoid of adventure, full of characters you forget constantly. You read them to experience the russian soul, not to have fun. The best Dostoievsky for me is "The Player", one of the shortest and one whose lessons I constantly quote, especially around a horse race or a casino lol.
If you want enjoyable classics, Alexandre Dumas or Theophile Gautier are my go to but Im French so maybe the anglo world has some authors too as brilliant as Dumas but I doubt it. The best russian classic is Master and Margherita, it's a bit less slow than average but Boulgakov is special (a bit their Kafka).